NAME

       lslocks - list local system locks

SYNOPSIS

       lslocks [options]

DESCRIPTION

       lslocks lists information about all the currently held file locks in a Linux system.

OPTIONS

       -b, --bytes
           Print the sizes in bytes rather than in a human-readable format.

           By default, the unit, sizes are expressed in, is byte, and unit prefixes are in power
           of 2^10 (1024). Abbreviations of symbols are exhibited truncated in order to reach a
           better readability, by exhibiting alone the first letter of them; examples: "1 KiB"
           and "1 MiB" are respectively exhibited as "1 K" and "1 M", then omitting on purpose
           the mention "iB", which is part of these abbreviations.

       -H, --list-columns
           List the available columns, use with --json or --raw to get output in machine-readable
           format.

       -i, --noinaccessible
           Ignore lock files which are inaccessible for the current user.

       -J, --json
           Use JSON output format.

       -n, --noheadings
           Do not print a header line.

       -o, --output list
           Specify which output columns to print. Use --help to get a list of all supported
           columns.

           The default list of columns may be extended if list is specified in the format +list
           (e.g., lslocks -o +BLOCKER).

       --output-all
           Output all available columns.

       -p, --pid pid
           Display only the locks held by the process with this pid.

       -r, --raw
           Use the raw output format.

       -u, --notruncate
           Do not truncate text in columns.

       -h, --help
           Display help text and exit.

       -V, --version
           Print version and exit.

OUTPUT

       COMMAND
           The command name of the process holding the lock.

       PID
           The process ID of the process.

       TYPE
           The type of lock; can be LEASE (created with fcntl(2)), FLOCK (created with flock(2)),
           POSIX (created with fcntl(2) and lockf(3)) or OFDLCK (created with fcntl(2)).

       SIZE
           Size of the locked file.

       INODE
           The inode number.

       MAJ:MIN
           The major:minor device number.

       MODE
           The lock’s access permissions (read, write). If the process is blocked and waiting for
           the lock, then the mode is postfixed with an '*' (asterisk).

       M
           Whether the lock is mandatory; 0 means no (meaning the lock is only advisory), 1 means
           yes. (See fcntl(2).)

       START
           Relative byte offset of the lock.

       END
           Ending offset of the lock.

       PATH
           Full path of the lock. If none is found, or there are no permissions to read the path,
           it will fall back to the device’s mountpoint and "..." is appended to the path. The
           path might be truncated; use --notruncate to get the full path.

       BLOCKER
           The PID of the process which blocks the lock.

       HOLDERS
           The holder(s) of the lock. The format of the holder is PID,COMMAND,FD. If a lock is an
           open file description-oriented lock, there can be more than one holder for the lock.
           See the NOTES below.

NOTES

       The lslocks command is meant to replace the lslk(8) command, originally written by Victor
       A. Abell <abe@purdue.edu> and unmaintained since 2001.

       "The process holding the lock" for leases, FLOCK locks, and OFD locks is a fake-concept.
       They are associated with the open file description on which they are acquired. With
       fork(2) and/or cmsg(3), multiple processes can share an open file description. So the
       holder process of a lease (or a lock) is not uniquely determined. lslocks shows the one of
       the holder processes in COMMAND and PID columns.

AUTHORS

       Davidlohr Bueso <dave@gnu.org>

SEE ALSO

       flock(1), fcntl(2), lockf(3)

REPORTING BUGS

       For bug reports, use the issue tracker at https://github.com/util-linux/util-linux/issues.

AVAILABILITY

       The lslocks command is part of the util-linux package which can be downloaded from Linux
       Kernel Archive <https://www.kernel.org/pub/linux/utils/util-linux/>.